Bookbinding process
View Patent ↗A curable hot melt adhesive is used as a primer on a book block. A conventional thermoplastic hot melt is then applied on top of the reactive hot melt before the cover material is positioned.
1. A method of improving the rounding process of hard cover books comprising the following steps, in the order of (1) applying a curable hot melt as a primer layer on a surface of a book block, (2) applying to said primer layer a thermoplastic hot melt, (3) applying a cover material, and (4) rounding the spine of the book.
2. The method of claim 1 wherein the curable hot melt is a reactive hot melt.
3. The method of 2 wherein the thermoplastic hot melt comprises ethylene vinyl acetate.
4. A process for binding books comprising applying a curable hot melt as a primer on a book block, applying to said curable hot melt a thermoplastic hot melt, and applying a cover material.
5. The process of claim 4 wherein the curable hot melt is a reactive hot melt.
6. The process of 5 wherein the thermoplastic hot melt comprises ethylene vinyl acetate.
7. The process of claim 4 wherein the book is a hard cover book.
8. A book prepared using the process of claim 7 .
9. The process of claim 4 wherein the book is a soft cover book.
10. A book prepared using the process of claim 9 .
11. A method of improving the rounding process of hard cover books comprising the following steps, applying a curable hot melt as a primer layer on a surface of a book block, applying to said primer layer a thermoplastic hot melt, applying a cover material, and rounding the spine of the book wherein the curable hot melt comprises a radiation curable hot melt or a moisture curable hot melt.
12. The method of claim 11 further comprising the following steps: choosing a curable hot melt adhesive; and choosing a thermoplastic hot melt so that crosslinking with the curable hot melt adhesive can occur.
13. The method of claim 11 , wherein the following steps are performed in the order of (1) applying a melted curable hot melt as a primer layer on a surface of a book block, (2) applying to said primer layer a melted thermoplastic hot melt, (3) applying a cover material, and (4) rounding the spine of the book.
14. The method of claim 11 , wherein the primer layer is applied at from 1 to 10 grams per square meter and the thermoplastic hot melt is applied at from 50 to 100 grams per square meter.
15. The method of claim 11 , wherein the curable hot melt comprises a urethane prepolymer and the thermoplastic hot melt comprises ethylene vinyl acetate.